[推薦]載入BitMap文件到 DirectDraw |
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axsoft
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載入Bitmap文件到 DirectDraw Loading Bitmap Files into DirectDraw
by Kieren Johnstone 載入位圖文件到 DirectDraw 譯:sea_bug 以下文章中英對照: Introduction
介紹 In this article I will briefly describe the process of using Windows' functions to load a bitmap (.bmp) file of any type, and place it on a newly-created DirectDraw surface. In this particular article, we will be using the DirectX 7.0 SDK.
在這篇文章里,我將簡要敘述一下使用Windows函數來載入任何類型的BMP圖象文件數據,並將數據存
放到一個新建立的DirectDraw的表面中。在這以后的篇幅里,我們將使用DirectX 7.0 SDK。 DirectDraw Surface Creation
創建DirectDraw表面 Creating a new DirectDraw surface is very easy, and this function will create a surface of any size. This can also be used as a general-purpose surface creation function, and if you were writing an engine class you'd probably put it in there somewhere.
創建一個DirectDraw表面是非常容易的,這個函數將根據大小來創建一個表面。這同樣能用于多種多
樣的表面創建函數,如果你要制作一個引擎類,你也許會把這個放在引擎的某處。 Listing 1
代碼列表 1
void CreateSurface(LPDIRECTDRAWSURFACE7 *lpSource, int xs, int ys) { DDSURFACEDESC2 ddsd; ZeroMemory(&ddsd, sizeof(ddsd)); ddsd.dwSize = sizeof(ddsd); ddsd.dwFlags = DDSD_CAPS | DDSD_WIDTH | DDSD_HEIGHT; ddsd.ddsCaps.dwCaps = DDSCAPS_OFFSCREENPLAIN; ddsd.dwWidth = xs; ddsd.dwHeight = ys; lpdd->CreateSurface(&ddsd, lpSource, NULL); } All this code does is create a DDSURFACEDESC2 structure that describes the dimensions of the surface, and tells DirectDraw that it's an off-screen surface. Then, the call to DirectDraw (in this case, DirectDraw is the lpdd pointer) just creates the surface.所有的這些代碼是為表面建立一個DDSURFACEDESC2的數據結構來記錄大小尺度,並且告訴DirectDraw 那是一個離屏表面。然后,呼叫DirectDraw(在這部分,DirectDraw是lpdd的指針)真正創建這個表面 。 Bitmap Loading 位圖載入 To load .bmp files we will use the standard Windows graphics library (GDI). This is best because if we're in a mode with a palette then Windows will automatically re-map the bitmap colours to the nearest in the palette. Here is the code that blits a loaded bitmap to a surface…. 要載入.BMP圖形文件,我們將使用標准的Windows圖形庫(GDI)。這個是最好的方法,因為如果我們是 在一個調色板的視頻模式,那麼Windows將自動將位圖映射到最接近的調色板顏色。以下的代碼是繪 制一個位圖數據到表面…… Listing 2 代碼列表 2 void DrawHBitmap(IDirectDrawSurface7 *lpSurface, HBITMAP hBitmap, int x, int y, int width, int height) { HDC hdcImage; HDC hdc; BITMAP bm; if (lpSurface == NULL || hBitmap == NULL) return; lpSurface->Restore(); hdcImage = CreateCompatibleDC(NULL); SelectObject(hdcImage, hBitmap); GetObject(hBitmap, sizeof(bm), &bm); width = width == 0 ? bm.bmWidth : width; height = height == 0 ? bm.bmHeight : height; lpSurface->GetDC(&hdc); BitBlt(hdc, x, y, width, height, hdcImage, 0, 0, SRCCOPY); lpSurface->ReleaseDC(hdc); DeleteDC(hdcImage); }and here is the code that loads, blits, then unloads the bitmap: 以下的代碼是把位圖載入、繪制、到數據釋放: Listing 3 代碼列表 3 void CreateBitmapSurface(LPDIRECTDRAWSURFACE7 lpSurface, char *fname, int xs, int ys) { HBITMAP hBitmap; CreateSurface(&lpSurface, xs, ys); hBitmap = LoadImage(NULL, fname, IMAGE_BITMAP, 0, 0, LR_LOADFROMFILE); DrawHBitmap(lpSurface, hBitmap, 0, 0, xs, ys); DeleteObject(hBitmap); }Quick Example 快速例程 And to round it all up, here's some example code that loads the file "test.bmp" (width = 128, height = 128) into the lpddsTest surface, and then releases it again: 圍繞著以下部分,我們將結束此章節,這里是一些例程代碼,它載入"test.bmp"文件(寬=128,高=12 8)到lpddTest表面中,並且將其釋放: Listing 4 代碼列表 4 void Example(void) { /* * Declare the surface object * 聲名表面對象 */ LPDIRECTDRAWSURFACE7 lpddsTest; /* * Load the bitmap file into it * 載入位圖文件 */ CreateBitmapSurface(lpddsTest, “test.bmp”, 128, 128); /* * The lpddsTest surface now contains the “test.bmp” file * lpddsTest表面已經包含了"test.bmp"文件數據 */ /* * Release the surface * 釋放表面 */ lpddsTest->Release(); }時間就是金錢---[ 發問前請先找找舊文章] 發表人 - axsoft 於 2002/08/15 10:57:27 |
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